Wulf, A., & Drummond, D. (2015). The invention of nature: Alexander von Humboldt's new world (Unabridged.). HighBridge Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWulf, Andrea, और David Drummond. The Invention of Nature: Alexander Von Humboldt's New World. Unabridged. [Minneapolis, MN]: HighBridge Audio, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWulf, Andrea, और David Drummond. The Invention of Nature: Alexander Von Humboldt's New World. Unabridged. HighBridge Audio, 2015.
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